> ok, i understand that a modular system is maybe not the best place to
> fit a vc radio receiver, it's more a standalone kind of stuff.
>
> but i'm decided to try to build one myself. i've been looking hard on
> the net for schematics on how to control the tuning from a voltage
> but never found anything i could understand. if anyone have some DIY
> idea for this, please let me know. thanks

I'm not very familiar with radio circuits but if there is a potentiometer
(variable resistor) used to tune the circuit the universal vactrol module
(A-101-9) may be used to tune the radio from a CV.

Best wishes
Dieter Doepfer